Fifteen months after her bitter divorce and an appearance on Oprah, Bay Area author Terry McMillan says the younger man who once helped her get her groove back -- only to break her heart by coming out of the closet -- is making her life a living hell. And, from the looks of things, it's about to get worse. McMillan's hairstylist ex-husband, Jonathan Plummer, has signed a book deal with Simon & Schuster for a fictionalized tell-all account based on his decadelong relationship with McMillan, whose own novel and movie about their early romance, "How Stella Got Her Groove Back,"...